JP5848160B2 - Rotor and motor - Google Patents

Description

  The present invention relates to a rotor and a motor.

  Conventionally, as shown in Patent Document 1, for example, a so-called continuous pole type rotor has been devised in which a plurality of magnets are arranged in the circumferential direction of the outer peripheral surface of a rotor core and a portion between the magnets functions as a pseudo magnetic pole portion. The pseudo magnetic pole portion functions as a magnetic pole opposite to the magnet by the magnetic action of the magnet. Thereby, the N pole and the S pole are alternately formed in the circumferential direction on the outer peripheral surface of the rotor. In such a configuration, the number of magnets can be reduced with respect to a rotor (full magnet type rotor) having the same number of magnetic poles and magnets, which is advantageous in terms of the number of parts and cost.

JP 9-327139 A

  By the way, although the pseudo magnetic pole portion functions as a magnetic pole different from the magnet provided in the rotor, it is not actually a magnet. Therefore, the magnetic flux of the magnet is not drawn strongly into the pseudo magnetic pole part, and as a result, there is a problem that a part of the magnetic flux of the magnet leaks in the axial direction through the rotating shaft, the motor case, and the like. When the magnetic flux leaks toward the rotating shaft, not only the effective magnetic flux decreases and the motor output decreases, but also the rotating shaft magnetized by the leaking magnetic flux attracts foreign matters.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotor and a motor that can suppress the leakage magnetic flux in the axial direction to a small extent.

In order to solve the above-mentioned problem, the invention according to claim 1 includes a first rotor block and a second rotor block that are arranged in parallel to the rotating shaft in the axial direction and configured to be integrally rotatable with the rotating shaft, Each of the first and second rotor blocks has a plurality of magnets arranged in the circumferential direction of the rotor core to form a magnet magnetic pole part, and the magnet magnetic pole part is opposite to the magnet magnetic pole part due to the magnetic action of the magnet. is pseudo magnetic pole portion that functions as a magnetic pole is formed, the magnet of the magnet and the second rotor block of the first rotor block, together are arranged in the axial direction of the rotary shaft is set to a different polarities The second rotab so as to cancel the leakage magnetic flux flowing from the magnet of the first rotor block through the rotating shaft. Wherein the axial length of the click magnet is set.

In the invention described in claim 1 and the inventions described in claims 2 and 4 below, the leakage magnetic flux in the axial direction of the magnet of the first rotor block (leakage magnetic flux passing through at least the rotating shaft) and the second rotor block The leakage flux in the axial direction of the magnets repels each other, and as a result, the leakage flux in the axial direction of each magnet of the first and second rotor blocks can be reduced. Thereby, the reduction of the effective magnetic flux for generating the rotational force of the rotor can be suppressed, the reduction of the motor output can be suppressed, and the magnetization of the rotating shaft can be suppressed.

In the first aspect of the invention, the axial length of the magnet of the second rotor block is set so as to cancel out the leakage magnetic flux flowing from the magnet of the first rotor block via the rotating shaft. And the leakage magnetic flux of the axial direction of each magnet of a 2nd rotor block can be suppressed less.

The invention according to claim 2 includes a first rotor block and a second rotor block that are arranged in parallel with the rotating shaft in the axial direction, and are configured to be integrally rotatable with the rotating shaft, wherein the first and second rotor blocks include: A plurality of magnets are arranged in the circumferential direction of the rotor core to form magnet magnetic pole portions, and between each magnet magnetic pole portion, a pseudo magnetic pole portion that functions as a magnetic pole opposite to the magnet magnetic pole portion due to the magnetic action of the magnet The magnet of the first rotor block and the magnet of the second rotor block are provided side by side in the axial direction of the rotating shaft, and are set to different polarities, and the second rotor block is The first rotor block is provided on both axial sides of the first rotor block.

  In the present invention, the leakage magnetic flux from the magnet of the first rotor block to both sides in the axial direction is suppressed by the magnetic flux of the magnet of the second rotor block provided on both sides in the axial direction of the first rotor block. It is possible to suppress the leakage magnetic flux of the battery.

According to a third aspect of the present invention, in the rotor according to the second aspect , the magnet of the first rotor block and the magnet of the second rotor block are set to have the same cross-sectional area perpendicular to the axial direction of the rotating shaft. The axial length of the magnet of the first rotor block is set to be twice the axial length of the magnet of the second rotor block.

In this invention, the leakage magnetic flux from the magnet of the first rotor block to both sides in the axial direction can be suitably suppressed by the magnetic flux of the magnet of the second rotor block.
The invention according to claim 4 includes a first rotor block and a second rotor block that are arranged side by side in the axial direction on the rotating shaft and are configured to be integrally rotatable with the rotating shaft, and the first and second rotor blocks include: A plurality of magnets are arranged in the circumferential direction of the rotor core to form magnet magnetic pole portions, and between each magnet magnetic pole portion, a pseudo magnetic pole portion that functions as a magnetic pole opposite to the magnet magnetic pole portion due to the magnetic action of the magnet The magnet of the first rotor block and the magnet of the second rotor block are provided side by side in the axial direction of the rotating shaft and are set to have different polarities, and the magnet of the first rotor block And a plastic magnet integrally including the magnet of the second rotor block

In this invention, since the magnets of the first and second rotor blocks can be integrally formed, the magnets of the first and second rotor blocks can be easily formed.
A fifth aspect of the present invention is a motor including the rotor according to any one of the first to fourth aspects.

  In this invention, since the leakage magnetic flux in the axial direction is suppressed to a low level, it is possible to provide a motor in which a decrease in output and magnetization of the rotating shaft are suppressed.

  Therefore, according to the above described invention, the leakage flux in the axial direction can be reduced.

Sectional drawing of the motor of embodiment. (A) The top view which shows the 1st rotor block of the same form, (b) The top view which shows the 2nd rotor block of the same form. Sectional drawing for demonstrating the effect | action of the motor of the form. Sectional drawing of the rotor of another example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
The motor M of this embodiment shown in FIG. 1 is a brushless motor. The motor case 1 includes a case body 2 made of a magnetic material and a substantially disc-shaped cover plate 3 that closes an opening of the case body 2. The case main body 2 having a bottomed cylindrical shape includes a cylindrical tubular portion 2a, a closing portion 2b for closing one end (upper end in FIG. 1) in the axial direction of the cylindrical portion 2a, and the cylindrical portion 2a. It is comprised from the annular flange part 2c extended in the radial direction outer side from the other end part of an axial direction. The cylindrical portion 2a, the closing portion 2b, and the flange portion 2c are integrally formed. The case body 2 of the present embodiment is formed by pressing a metal plate made of a magnetic material. Then, the cover plate 3 is fixed to the flange portion 2 c of the case body 2, whereby the opening of the case body 2 is closed by the cover plate 3.

  A cylindrical first stator 11 and second stator 12 are fixed to the inner peripheral surface of the cylindrical portion 2a. One first stator 11 is provided, and one second stator 12 is provided on each side of the first stator 11 in the axial direction. Each of the stators 11 and 12 includes a cylindrical stator core 13 and a coil (not shown) wound around the stator core 13. The stator core 13 of each of the stators 11 and 12 is fitted into the cylindrical portion 2a, and the cylindrical outer peripheral surface of each stator core 13 is in pressure contact with the inner peripheral surface of the cylindrical portion 2a. The stator core 13 of each of the stators 11 and 12 is formed by laminating a plurality of plate members made of a magnetic material such as metal in the axial direction of the rotary shaft 15 and caulking them together.

  A rotor 14 is accommodated in the cylindrical portion 2 a of the case body 2. The rotor 14 includes a rotating shaft 15 and a first rotor block 21 and a second rotor block 22 that can rotate integrally with the rotating shaft 15. The first and second rotor blocks 21 and 22 are provided corresponding to the first and second stators 11 and 12, respectively. That is, one first rotor block 21 is provided inside the first stator 11. One second rotor block 22 is provided on each side of the first rotor block 21 in the axial direction, and is disposed inside the pair of second stators 12.

  The rotating shaft 15 is made of a magnetic material and has a cylindrical shape. A base end portion (upper end portion in FIG. 1) of the rotating shaft 15 is supported by a bearing 16 provided at a radial center portion of the closing portion 2b, while a distal end portion of the rotating shaft 15 is supported. Is supported by a bearing 17 provided at the radial center of the cover plate 3. Note that the distal end portion of the rotating shaft 15 penetrates the radial center portion of the cover plate 3 and projects (exposes) to the outside of the motor case 1.

  As shown in FIG. 2A, the first rotor block 21 has a rotor core 23 fixed to the rotary shaft 15 so as to be integrally rotatable. The rotor core 23 is formed by laminating a plurality of plate members made of a magnetic material such as metal in the axial direction of the rotary shaft 15 and caulking them together. The rotor core 23 has a cylindrical shape, and the rotary shaft 15 is press-fitted and fixed in a fixing hole 23a formed at the center thereof.

  In the rotor core 23, four magnet magnetic pole portions 24 each having a holding hole 24a are formed at equal intervals in the circumferential direction (90 degree intervals). The holding hole 24a of each magnet magnetic pole portion 24 is formed slightly inside the outer peripheral surface of the rotor core 23 and penetrates the rotor core 23 in the axial direction. A magnet 25a is inserted and held in each holding hole 24a. The magnets 25a have the same shape. Specifically, each magnet 25 a has a rectangular parallelepiped shape that is long in the axial direction of the rotor core 23, and the axial length thereof is formed to be equal to the axial length of the rotor core 23. Each magnet 25a has both end surfaces in the radial direction in contact with the holding holes 24a, and gaps are formed between the both sides in the circumferential direction and the holding holes 24a.

  A pseudo magnetic pole portion 26 is formed between the holding holes 24a in the circumferential direction. The pseudo magnetic pole portions 26 are portions that do not have the holding holes 24a in the outer peripheral portion of the rotor core 23, and are formed at four circumferentially equal intervals (intervals of 90 degrees). That is, on the outer peripheral portion of the rotor core 23, the magnet magnetic pole portions 24 and the pseudo magnetic pole portions 26 are alternately arranged in the circumferential direction at equal intervals (45 ° intervals).

  Each second rotor block 22 has the same configuration except that the length in the axial direction is half that of the first rotor block 21 described above. For this reason, in the second rotor block 22, the same components as those in the first rotor block 21 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The magnet 25a of the first rotor block 21 is magnetized so that the radially outer side is the S pole and the radially inner side is the N pole. Thereby, the polarity of the outer peripheral surface of the magnet magnetic pole portion 24 of the first rotor block 21 is the S pole. And each pseudo magnetic pole part 26 of the 1st rotor block 21 functions as an N pole by the magnetic action of this magnet 25a. As a result, the magnetic poles on the outer peripheral portion of the first rotor block 21 are composed of eight poles in which the N poles and the S poles are alternately arranged in the circumferential direction.

  As shown in FIG. 2B, the magnet 25b of each second rotor block 22 has the same configuration except that the magnet 25a of the first rotor block 21 has a different axial length. Yes. That is, the magnets 25 a and 25 b are set to have the same cross-sectional shape and cross-sectional area perpendicular to the axial direction of the rotating shaft 15. Further, as shown in FIG. 3, the axial length D1 of the magnet 25a of the first rotor block 21 is set to be twice the axial length D2 of the magnet 25b of the second rotor block 22. That is, the axial length D2 of the magnet 25b of each second rotor block 22 is set so as to cancel out the leakage magnetic flux flowing from the magnet 25a of the first rotor block 21 via the rotary shaft 15. In this embodiment, the axial length D1 of the magnet 25a and the axial length D2 of the magnet 25b coincide with the axial length of the first rotor block 21 and the axial length of the second rotor block 22, respectively. ing.

  As shown in FIG. 2B, the magnet 25b of the second rotor block 22 is opposite to the magnet 25a of the first rotor block 21, so that the radially outer side is the north pole and the radially inner side is the south pole. Magnetized. Thereby, the polarity of the outer peripheral surface of the magnet magnetic pole portion 24 of the second rotor block 22 becomes the N pole. The pseudo magnetic pole portions 26 of the second rotor block 22 function as S poles by the magnetic action of the magnet 25b. As a result, the magnetic poles on the outer peripheral portion of each second rotor block 22 are composed of eight poles in which the north and south poles are alternately arranged in the circumferential direction.

  Each second rotor block 22 is provided with a gap between the first rotor block 21 and the first rotor block 21 in the axial direction. Each rotor block 21, 22 has a rotational axis so that the circumferential position of each magnet magnetic pole portion 24 of the first rotor block 21 matches the circumferential position of each magnet magnetic pole portion 24 of the second rotor block 22. 15 is fixed. That is, the magnets 25a of the first rotor block 21 and the magnets 25b of the second rotor block 22 are arranged in the axial direction. The pseudo magnetic pole portions 26 of the first rotor block 21 and the pseudo magnetic pole portions 26 of the second rotor block 22 are also arranged in the axial direction.

  As shown in FIG. 1, an annular sensor magnet 31 is integrally rotated on the rotary shaft 15 of the rotor 14 at a position between one second rotor block 22 (the lower one in FIG. 1) and the bearing 17. It is fixed as possible. The sensor magnet 31 is magnetized so that the N pole and the S pole are alternately arranged in the circumferential direction.

  A circuit board 32 on which circuit elements (not shown) for controlling the motor M are mounted is fixed to the inner surface of the cover plate 3. On the circuit board 32, a hall sensor 33 is disposed so as to face the sensor magnet 31 in the axial direction. The hall sensor 33 is a hall IC provided with a hall element. The circuit board 32 is electrically connected to a drive control circuit (not shown) provided outside the motor M.

Next, the operation of this embodiment will be described.
When power is supplied to the coils of the stators 11 and 12, the rotor 14 is rotated in accordance with the rotating magnetic field generated in the stators 11 and 12. Here, the Hall sensor 33 detects a change in the magnetic field of the sensor magnet 31 that rotates integrally with the rotating shaft 15 of the rotor 14 and sends a rotation detection signal, which is a pulse signal corresponding to the detected change in the magnetic field, to the drive control circuit. Output. The drive control circuit detects rotation information (rotation speed, rotation position, etc.) of the rotor 14 based on the rotation detection signal. The drive control circuit then reverses the current supplied to the coils of the first and second stators 11 and 12 so that the rotation speed of the rotor 14 becomes a desired rotation speed based on the detected rotation information of the rotor 14. Control individually so that they are equal. At this time, in the first rotor block 21 and the second rotor block 22, the polarities of the magnetic poles aligned in the axial direction (the magnet magnetic pole portions 24 and the pseudo magnetic pole portions 26) are opposite to each other. A controlled power supply is supplied accordingly. The rotating magnetic field generated by the first stator 11 acts on the first rotor block 21, and the rotating magnetic field generated by the second stator 12 acts on the second rotor block 22, whereby the rotor 14 is It is rotated.

  Here, as shown in FIG. 3, a magnetic flux passage is formed by the rotor core 23 of each of the rotor blocks 21 and 22, the rotating shaft 15, the motor case 1, and the stator core 13 of each of the stators 11 and 12, and each magnet 25a. , 25b, the magnetic flux passing through this magnetic flux passage becomes the axial leakage magnetic flux. In the motor M of the present embodiment, the magnet 25a of the first rotor block 21 and the magnet 25b of the second rotor block 22 are provided side by side in the axial direction of the rotary shaft 15, and are set to have different polarities. Thereby, the leakage magnetic flux X1 in the axial direction of the magnet 25a of the first rotor block 21 and the leakage magnetic flux X2 in the axial direction of the magnet 25b of each second rotor block 22 repel each other, and as a result, the shaft Leakage magnetic fluxes X1 and X2 in the direction are less likely to occur. As a result, the decrease in the effective magnetic flux for generating the rotational force of the rotor 14 is suppressed, the decrease in the output of the motor M is suppressed, and the magnetization of the rotating shaft 15 is suppressed.

  Further, in the rotor 14 of the present embodiment, the second rotor block 22 is provided on each side of the first rotor block 21 in the axial direction. For this reason, the leakage magnetic flux X1 that tends to flow from the rotor core 23 of the first rotor block 21 to both axial sides (the closed portion 2b side and the cover plate 3 side) is the magnetic flux (leakage) of the magnet 25b of the pair of second rotor blocks 22. Repel each other with the magnetic flux X2). That is, it is difficult for both leakage fluxes X1 and X2 to occur on both sides in the axial direction. Furthermore, in this embodiment, the axial length D1 of the magnet 25a of the first rotor block 21 is set to twice the axial length D2 of the magnet 25b of the second rotor block 22. In other words, the magnetic force of the magnet 25 a of the first rotor block 21 is twice the magnetic force of the magnet 25 b of the second rotor block 22. For this reason, the amount of leakage magnetic flux X1 to one side of the magnet 25a in the axial direction and the amount of leakage magnetic flux X2 of each magnet 25b are substantially equal, and the axial leakage magnetic fluxes X1 and X2 are more unlikely to occur. .

Next, characteristic effects of the present embodiment will be described.
(1) The first and second rotor blocks 21 and 22 fixed to the rotary shaft 15 have magnet magnetic pole portions 24 and pseudo magnetic pole portions 26 alternately in the circumferential direction of the rotor core 23. Magnets 25 a and 25 b are respectively provided in each magnet magnetic pole portion 24 of the first rotor block 21 and each magnet magnetic pole portion 24 of the second rotor block 22, and the magnet 25 a of the first rotor block 21 and the magnet of the second rotor block 22. 25b are provided side by side in the axial direction of the rotating shaft 15, and are set to polarities different from each other. As a result, the leakage magnetic flux in the axial direction of the magnet 25a of the first rotor block 21 (leakage magnetic flux passing through the rotating shaft 15) and the leakage magnetic flux in the axial direction of the magnet 25b of the second rotor block 22 repel each other. Further, the leakage flux in the axial direction of the magnets 25a and 25b of the first and second rotor blocks 21 and 22 can be reduced. As a result, a decrease in the effective magnetic flux for generating the rotational force of the rotor 14 can be suppressed, a decrease in the output of the motor M can be suppressed, and the magnetization of the rotating shaft 15 can be suppressed.

  (2) The axial length D2 of the magnet 25b of each second rotor block 22 is set so as to cancel out the leakage magnetic flux flowing from the magnet 25a of the first rotor block 21 via the rotary shaft 15. For this reason, the leakage magnetic flux of the axial direction of each magnet 25a, 25b of the 1st and 2nd rotor blocks 21 and 22 can be suppressed less.

  (3) The second rotor block 22 is provided on each side of the first rotor block 21 in the axial direction. Thereby, the leakage magnetic flux from the magnet 25a of the first rotor block 21 to both sides in the axial direction is suppressed by the magnetic flux of the magnet 25b of the second rotor block 22 provided on both sides of the first rotor block 21 in the axial direction. Therefore, the leakage flux in the axial direction can be reduced.

  (4) The magnet 25a of the first rotor block 21 and the magnet 25b of the second rotor block 22 have the same cross-sectional area perpendicular to the axial direction of the rotary shaft 15, and the axial direction of the magnet 25a of the first rotor block 21 The length D1 is set to twice the axial length D2 of the magnet 25b of the second rotor block 22. For this reason, the leakage magnetic flux from the magnet 25 a of the first rotor block 21 to both sides in the axial direction can be suitably suppressed by the magnetic flux of the magnet 25 b of the second rotor block 22.

In addition, you may change embodiment of this invention as follows.
In the rotor 14 of the above embodiment, the magnets 25a and 25b are separated from each other, but the magnets 25a and 25b may be integrally formed. For example, the rotor 14A shown in FIG. 4 includes a plastic magnet 40 that integrally includes a magnet (first magnet portion 41) of the first rotor block 21 and a magnet (second magnet portion 42) of the second rotor block 22. Yes.

  The plastic magnet 40 is made of a resin material and is integrally formed with the rotor core 23 of the first and second rotor blocks 21 and 22 by insert molding. The plastic magnet 40 is filled in each holding hole 24a of each rotor core 23, and the portion between the holding hole 24a of the first rotor block 21 and the holding hole 24a of the second rotor block 22 between the axial directions. Are filled in the radially inner portion (the gap portion in the axial direction of each rotor core 23).

  In the plastic magnet 40, the first magnet portion 41, which is a portion filled in the holding hole 24a of the first rotor block 21, includes a magnetic body, and the radially outer side is the S pole and the radially inner side is the N pole. Is so magnetized. Thereby, the polarity of the outer peripheral surface of the magnet magnetic pole portion 24 of the first rotor block 21 is the S pole. On the other hand, the second magnet portion 42, which is a portion filled in the holding hole 24a of the second rotor block 22, includes a magnetic material, and is magnetized so that the radially outer side is an N pole and the radially inner side is an S pole. Has been. Thereby, the polarity of the outer peripheral surface of the magnet magnetic pole part 24 of the 1st rotor block 21 turns into N pole.

  Further, in the plastic magnet 40, the connecting portion 43 formed between the first magnet portion 41 and the second magnet portion 42 in the axial direction does not include a magnetic body, and the first magnet portion 41 and the second magnet portion. 42 is a magnetic resistance. Further, in the plastic magnet 40, the inter-core connecting portion 44 formed on the radially inner side of the connecting portion 43 connects the rotor cores 23 adjacent in the axial direction.

  According to such a configuration, the first and second magnet portions 41 and 42 can be integrally formed, so that the magnet portions 41 and 42 can be easily formed. In the configuration shown in FIG. 4, the inter-core connecting portion 44 is integrally formed with the plastic magnet 40. However, the configuration is not limited to this configuration. You may form the connection part 44 between cores with the resin member which does not contain a magnetic body.

  In the above embodiment, a gap is provided between the first rotor block 21 and the second rotor block 22 in the axial direction, but the rotor blocks 21 and 22 are in contact with each other in the axial direction without providing this gap. Also good.

  In the above embodiment, the axial length D1 of the magnet 25a of the first rotor block 21 is set to twice the axial length D2 of the magnet 25b of the second rotor block 22, but this is particularly limited to this. The ratio of the axial lengths D1 and D2 of the magnets 25a and 25b may be changed as appropriate according to the configuration.

  In the above embodiment, the magnets 25a and 25b are configured such that both end surfaces in the radial direction are in contact with the holding hole 24a, but other than this, for example, a slight gap is provided in the radial direction with respect to the holding hole 24a. The magnets 25a and 25b may be arranged so as to face each other.

  In the above embodiment, the magnets 25a and 25b are set to have the same cross-sectional shape and cross-sectional area perpendicular to the axial direction of the rotating shaft 15. It is sufficient if they are identical.

  In the rotor 14 of the above-described embodiment, one first rotor block 21 is provided, and one second rotor block 22 is provided on each side of the first rotor block 21 in the axial direction. It is not particularly limited. For example, a plurality of first and second rotor blocks 21 and 22 may be alternately provided. Further, for example, the first and second rotor blocks 21 and 22 may be provided one by one, and they may be arranged in the axial direction.

-You may comprise the polarity of each magnet 25a, 25b in the said embodiment opposite.
In the above embodiment, each of the first and second rotor blocks 21 and 22 includes four magnets 25a and 25b. However, the present invention is not limited to this, and the number of magnets 25a and 25b depends on the configuration. You may change suitably.

  The configuration such as the shape of the case body 2 is not limited to the shape of the above embodiment. For example, the cylindrical part 2a may be a cylinder other than the cylinder (for example, a polygonal cylinder, an elliptic cylinder, etc.). Moreover, the cylindrical part 2a and the obstruction | occlusion part 2b may be formed separately, and may be assembled | attached mutually. Moreover, the case main body 2 does not necessarily need to include the flange portion 2c.

In the above embodiment, the motor case 1 includes the cover plate 3, but may include only the case main body 2 without the cover plate 3.
In the above embodiment, the magnets 25a and 25b are configured as an IPM type rotor embedded in the rotor core 23 (magnet magnetic pole portion 24). You may comprise as a rotor.

  In the above embodiment, the present invention is applied to the inner rotor type motor M. However, the present invention is not particularly limited thereto, and may be applied to an outer rotor type motor.

  M ... Motor, 14, 14A ... Rotor, 15 ... Rotating shaft, 21 ... First rotor block, 22 ... Second rotor block, 23 ... Rotor core, 24 ... Magnet magnetic pole part, 25a, 25b ... Magnet, 26 ... Pseudo magnetic pole part , 40 ... plastic magnet, 41 ... first magnet part (magnet), 42 ... second magnet part (magnet), D1, D2 ... axial length of the magnet, X1, X2 ... magnetic flux.

Claims (5)

A first rotor block and a second rotor block which are arranged in parallel to the rotation shaft in the axial direction and configured to be integrally rotatable with the rotation shaft;
In each of the first and second rotor blocks, a plurality of magnets are arranged in the circumferential direction of the rotor core to form a magnet magnetic pole part, and the magnet magnetic pole part is defined between the magnet magnetic pole parts by the magnetic action of the magnet. A pseudo magnetic pole part that functions as the opposite magnetic pole is formed,
The magnet of the first rotor block and the magnet of the second rotor block are provided side by side in the axial direction of the rotating shaft, and are set to have different polarities .
The rotor is characterized in that the axial length of the magnet of the second rotor block is set so as to cancel the leakage magnetic flux flowing from the magnet of the first rotor block via the rotating shaft . A first rotor block and a second rotor block which are arranged in parallel to the rotation shaft in the axial direction and configured to be integrally rotatable with the rotation shaft;
In each of the first and second rotor blocks, a plurality of magnets are arranged in the circumferential direction of the rotor core to form a magnet magnetic pole part, and the magnet magnetic pole part is defined between the magnet magnetic pole parts by the magnetic action of the magnet. A pseudo magnetic pole part that functions as the opposite magnetic pole is formed,
The magnet of the first rotor block and the magnet of the second rotor block are provided side by side in the axial direction of the rotating shaft, and are set to have different polarities.
The rotor is characterized in that the second rotor block is provided on both sides in the axial direction of the first rotor block. The rotor according to claim 2 , wherein
The magnet of the first rotor block and the magnet of the second rotor block are set to have the same cross-sectional area perpendicular to the axial direction of the rotating shaft,
The axial length of the magnet of the first rotor block is set to be twice the axial length of the magnet of the second rotor block. A first rotor block and a second rotor block which are arranged in parallel to the rotation shaft in the axial direction and configured to be integrally rotatable with the rotation shaft;
In each of the first and second rotor blocks, a plurality of magnets are arranged in the circumferential direction of the rotor core to form a magnet magnetic pole part, and the magnet magnetic pole part is defined between the magnet magnetic pole parts by the magnetic action of the magnet. A pseudo magnetic pole part that functions as the opposite magnetic pole is formed,
The magnet of the first rotor block and the magnet of the second rotor block are provided side by side in the axial direction of the rotating shaft, and are set to have different polarities.
A rotor comprising a plastic magnet integrally including the magnet of the first rotor block and the magnet of the second rotor block. Motor comprising the rotor according to any one of claims 1-4.